A Liberty Korea Post correspondent inside North Korea informed the Seoul office that a Number 1 event [by Kim Jong-un] was being planned in secret at the Sinpo Shipyard.
On June 15th, the Liberty Korea correspondent relayed that Mrs. A from Hyesan had visited her in-laws in Sinpo, Hamkyungnamdo, for ten days early June because her father-in-law had fallen ill. She acquired her travel permit, her certificate of medical examination from the disease control center, arrived in Sinpo railroad station and went on to her in-laws at a village near the shipyard.
Her father-in-law's condition became severe several days later. She took him to the city hospital and looked after him, going back and forth to the hospital every day.
One day about seven in the evening, the road near the Sinpo Shipyard was blocked. Young men dressed in civilian clothes and security agents checked all the locals entering the area. The hospital informed the patients and families that a Number 1 event was about to take place and that they should stay away from the area.
A doctor from the hospital said that Kim Jong-un visited Sinpo Shipyard two to three times a year for closed visits since Kim Jong-un had a special interest in the shipyard. According to Mrs. A, the checkpoint was active from the evening until the following morning. She heard that Kim Jong-un was at the shipyard's submarine yard and that he had boarded the submarine for a sea trial. Then, he was rumored to have moved on to his floating resort.
There was no official reporting confirming the advance team's movement for the Number 1 event, but she heard that the team members left the area on the train on June 11th.
North Korean media reported about Sinpo Shipyard when Kim Jong-un visited the facility last year.